Lab: Physical and Chemical Changes

Question 1

According to the lab guide, which changes below will you look for in order to test the hypothesis? Check all that apply.

Revolt · Accepted Answer

changes in shape or size; color changes; whether changes are easily reversible; temperature changes; formation of precipitates or gases; changes of state (gas, liquid, or solid)

Question 2

Question 2

Revolt · Accepted Answer

of the substances: initial appearance; of the substances.: final appearance

Question 3

Check all that apply.

Revolt · Accepted Answer

Wear chemical resistant gloves.

Question 4

Check all that apply.

Revolt · Accepted Answer

Use tongs to remove hot items.; Turn off after use.

Question 5

Check all that apply.

Revolt · Accepted Answer

Clear the lab table of paper.; Tie back long hair.; Turn off after use.

Question 6

✔ yesX no

Revolt · Accepted Answer

✔ yes

Question 7

Have you gathered all the materials needed? ✔ yesno

Revolt · Accepted Answer

✔ yes

Question 8

Which answer below correctly identifies the type of change and the explanation for the mixture of calcium carbonate and hydrochloric acid?

Revolt · Accepted Answer

chemical change because gas formation was observed, which indicated that the calcium carbonate was transformed into a different substance

Question 9

Which answer below correctly identifies the type of change and the explanation for the boiling of water?

Revolt · Accepted Answer

physical change because even though gas formation was observed, the water was undergoing a state change, which means that its original properties are preserved

Question 10

Which answer below correctly identifies the type of change and the explanation for the heating of copper(II) sulfate pentahydrate?

Revolt · Accepted Answer

chemical change because gas was released along with a color change, which indicated that the copper(II) sulfate pentahydrate was transformed into a different substance

Lab: Physical and Chemical Changes Answers

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